/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.obfuscate;

import proguard.classfile.*;
import proguard.classfile.constant.ClassConstant;
import proguard.classfile.constant.visitor.ConstantVisitor;
import proguard.classfile.editor.ConstantPoolEditor;
import proguard.classfile.util.SimplifiedVisitor;
import proguard.classfile.visitor.*;

/**
 * This <code>ClassVisitor</code> renames the class names and class member names of the classes it visits, using names
 * previously determined by the obfuscator.
 *
 * @see ClassObfuscator
 * @see MemberObfuscator
 *
 * @author Eric Lafortune
 */
public class ClassRenamer extends SimplifiedVisitor implements ClassVisitor, MemberVisitor, ConstantVisitor {
    // Implementations for ClassVisitor.

    public void visitProgramClass(ProgramClass programClass) {
        // Rename this class.
        programClass.thisClassConstantAccept(this);

        // Rename the class members.
        programClass.fieldsAccept(this);
        programClass.methodsAccept(this);
    }

    public void visitLibraryClass(LibraryClass libraryClass) {
        libraryClass.thisClassName = ClassObfuscator.newClassName(libraryClass);

        // Rename the class members.
        libraryClass.fieldsAccept(this);
        libraryClass.methodsAccept(this);
    }

    // Implementations for MemberVisitor.

    public void visitProgramMember(ProgramClass programClass, ProgramMember programMember) {
        // Has the class member name changed?
        String name = programMember.getName(programClass);
        String newName = MemberObfuscator.newMemberName(programMember);
        if (newName != null && !newName.equals(name)) {
            programMember.u2nameIndex = new ConstantPoolEditor(programClass).addUtf8Constant(newName);
        }
    }

    public void visitLibraryMember(LibraryClass libraryClass, LibraryMember libraryMember) {
        String newName = MemberObfuscator.newMemberName(libraryMember);
        if (newName != null) {
            libraryMember.name = newName;
        }
    }

    // Implementations for ConstantVisitor.

    public void visitClassConstant(Clazz clazz, ClassConstant classConstant) {
        // Update the Class entry if required.
        String newName = ClassObfuscator.newClassName(clazz);
        if (newName != null) {
            // Refer to a new Utf8 entry.
            classConstant.u2nameIndex = new ConstantPoolEditor((ProgramClass)clazz).addUtf8Constant(newName);
        }
    }
}
